Animals such as vermin, frogs or rats that enter drain pipes can become a problem for water quality. With our Stop Silent Light frog flap, the penetration of small animals into your sewage system is reliably and permanently eliminated. The simple installation in the industrial as well as in the private waste water sector is quickly installed due to a non-positive clamping inside the pipe. Furthermore, the frog flap is a reliable backwater protection for waste water with a backpressure of up to 0.5 bar. This frog flap prevents an unpleasant stench which the waste water produces. Here the waste water pipe is sealed airtight.